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author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2018-08-16 14:06:46 -0500 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 22:43:37 +0200 |
commit | 0fad94cf10165084189bc160cc48f8004ea11ee8 (patch) | |
tree | ef47d364bce55960c1aadc201a99a21156406ffd /crypto/Makefile | |
parent | ff225750dc4e70ce5c4288fe3850ae9dc69df024 (diff) |
switchtec: Fix Spectre v1 vulnerability
commit 46feb6b495f7628a6dbf36c4e6d80faf378372d4 upstream.
p.port can is indirectly controlled by user-space, hence leading to
a potential exploitation of the Spectre variant 1 vulnerability.
This issue was detected with the help of Smatch:
drivers/pci/switch/switchtec.c:912 ioctl_port_to_pff() warn: potential spectre issue 'pcfg->dsp_pff_inst_id' [r]
Fix this by sanitizing p.port before using it to index
pcfg->dsp_pff_inst_id
Notice that given that speculation windows are large, the policy is to kill
the speculation on the first load and not worry if it can be completed with
a dependent load/store [1].
[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Logan Gunthorpe <logang@deltatee.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto/Makefile')
0 files changed, 0 insertions, 0 deletions